<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="../vue.js"></script>
</head>
<body>
    <div id="app">
        <!-- 
            key 是唯一的,不重复的值,索引不能使用,key值一般情况下会使用id,如果没有id,则需要自己设计一个属性作为唯一的值当前key值
         -->
         <!-- 静态列表 -->  
         <!-- <ul>
            <li v-for="(item,index) in arr" :key="item">{{ item }}</li>
         </ul> -->
         <!-- 动态列表 -->
         <span v-for="(item,index) in brr" :key="item">
            <input type="radio">{{ item }}
         </span>
         <button @click="add">添加</button>
    </div>
    <script>
        new Vue({
            el:"#app",
            data:{
                // arr:["狗蛋","翠花","铁柱"],
                brr:[1,2,3]
            },
            methods: {
                add(){
                    var len = this.brr.length+1;
                    this.brr.unshift(len)
                }
                
            }
        })
    </script>
</body>
</html>